Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Category
Mineral (Pseudomorph)
Browse mineral (pseudomorph) specimens identified by the Rock Identifier community.
Learn about Mineral (Pseudomorph) in the encyclopedia
View all →
Limonite (Ironstone)
Goethite/Limonite (Hydrated iron(III) oxide-hydroxide)
mineral
Selenite (Satin Spar)
Gypsum (CaSO4·2H2O)
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Calcite
Calcite (Mineral; CaCO₃)
Mineral
Quartzite (with mineral vein)
Metamorphosed Quartz-rich Sandstone (SiO2)
metamorphic
Mica Group Minerals
There isn't a single scientific name as 'Mica' refers to a group of phyllosilicate minerals. Common scientific names include Muscovite (KAl₂ (AlSi₃O₁₀)(OH)₂), Biotite (K(Mg,Fe)₃AlSi₃O₁₀(OH)₂), Phlogopite (KMg₃AlSi₃O₁₀(OH)₂), and Lepidolite (K(Li,Al)₃(Al,Si,Rb)₄O₁₀(F,OH)₂).
Mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Sandstone
Arenite (SiO2 based with various mineral cements)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
mineral
Banded Gneiss
Gneiss (pronounced 'nice')
metamorphic
Fossil Shark Tooth
Odontaspididae (Sand Tiger Shark family)
fossil
Likely weathered quartz-rich rock fragment
Uncertain; possibly granitic pegmatite or quartz-bearing metamorphic rock
igneous
Fluorite
Calcium Fluoride (CaF2)
mineral
Green Aventurine and Clear Quartz Bracelet
Quartz variety with Fuchsite inclusions (Aventurine) and pure Silicon Dioxide (SiO2)
gemstone
Fluorite
Calcium Fluoride (CaF2)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Fluorite
Fluorite (Calcium Fluoride - CaF2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Rainbow Fluorite
Calcium Fluoride (CaF2)
mineral
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Quartz-rich mineral fragment
Quartz (silicon dioxide, SiO₂), possibly milky quartz
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Boxwork Siderite or Sepatarian Nodule Weathering
Siderite (FeCO3) with secondary mineralization or Boxwork Geode fragment
sedimentary
Sandstone
Arenite (clastic sedimentary rock)
sedimentary
Schist
Mica schist, likely muscovite–biotite schist with quartz and feldspar
metamorphic
Green Fluorite (Botryoidal/Massive)
Calcium Fluoride (CaF2)
mineral
Gneiss with Quartz Veining
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss
metamorphic
Granite Pebbles
Granite (composed primarily of Quartz SiO2, Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8), and Mica)
igneous
Nickel coin (U.S. currency)
Cupronickel (75% Copper, 25% Nickel alloy)
man-made alloy (metallic)
Quartz Vein / Quartz Matrix
Silicon Dioxide (SiO2)
mineral
Tiger's Eye
SiO2 (Silicon Dioxide with iron inclusions)
Mineral
Granitic Gneiss
Gneiss (Metamorphic rock predominantly containing quartz, K-feldspar, and plagioclase)
metamorphic
Schist
Mica Schist
metamorphic
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Peacock Ore (Bornite or Iridescent Chalcopyrite)
Bornite (Cu5FeS4) or Acid-treated Chalcopyrite (CuFeS2)
mineral
Blue Howlite (Dyed)
Dyed Howlite (Calcium Borosilicate Hydroxide, Ca2B5SiO9(OH)5)
mineral
Sandstone (Ferruginous)
Arenite (SiO2 based with Fe2O3 banding)
sedimentary
Sandstone
Arenite
sedimentary
Blue Howlite (Dyed)
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral